Open-source alternatives to Source Map Explorer

Bundlesize is a continuous integration tool used to calculate JavaScript bundle weights, track asset growth, and block deployments that exceed predefined size limits. It functions as a bundle size validator and reporter that monitors JavaScript build files to prevent unexpected growth. The tool integrates directly into build pipelines to enforce frontend performance budgeting. It communicates validation results back to version control platforms via API calls, allowing it to signal when bundle size limits are exceeded and block pull requests in continuous integration workflows. The system ide

Rolldown is a high-performance JavaScript and TypeScript module bundler written in Rust. It functions as a fast module compiler that implements a Rollup-compatible API to ensure compatibility with existing workflows and plugins while specializing in ECMAScript Module formats. The project distinguishes itself by using a Rust-based core engine and lazy compilation to reduce the time spent resolving and transforming source code. It focuses on minimizing final delivery sizes through static analysis and tree-shaking to remove unused code. The toolset covers a broad range of build capabilities, in

webpack-bundle-analyzer is a bundle size analysis tool and Webpack build plugin that visualizes the composition of web application assets. It generates an interactive treemap to identify large dependencies and analyze the distribution of modules within the final payload. The tool functions as a bundle visualizer and a static report generator, exporting analysis data as standalone HTML and JSON files. It supports live bundle tracking via WebSockets during development and allows for the analysis of existing static stats files through a command line interface. The project provides capabilities

axe-core is an automated accessibility testing engine and compliance auditor designed to scan web and mobile interfaces for violations of industry accessibility standards. It functions as a programmatic scanner and linter that analyzes HTML and source code to identify barriers and verify compliance with accessibility guidelines. The project distinguishes itself by combining a DOM-based rule engine with computer vision and machine learning to detect complex violations that evade traditional analysis, such as visual heading discrepancies and informative images. It provides specialized capabilit

Revive is a configurable static analysis linter and code quality tool for Go. It analyzes source code to detect common coding mistakes, identify style violations, and enforce language standards without executing the program. The project functions as both a command line tool and an embeddable analysis engine. This allows the core linting logic to be integrated as a library into other Go applications for programmatic code inspection. The tool supports custom rule sets and severity levels managed through a structured configuration file. It provides capabilities for suppressing specific warnings

This project is a binary static analysis tool designed to recover hidden and non-standard encoded strings from compiled binaries. It functions as a malware analysis utility and string decryptor, extracting obfuscated text to reveal concealed program behavior without executing the code. The tool automates the recovery of embedded strings through a combination of emulated instruction execution and abstract syntax tree evaluation. It utilizes pattern-based heuristic detection to identify obfuscation routines and employs cross-platform binary parsing to process multiple executable formats. The s

This project is a performance measurement framework and microbenchmarking library designed for C++ and Python. It provides a toolset for measuring the execution time of small code fragments using high-resolution timers, calculating statistical aggregates, and analyzing asymptotic complexity. The framework distinguishes itself through specialized capabilities for multithreaded performance testing, using synchronized execution to measure parallel throughput. It includes mechanisms to prevent compiler optimizations from removing benchmarked code and supports complex parameterization via Cartesia

TFLint is a static analysis tool and infrastructure-as-code validator designed to identify errors and enforce best practices within Terraform configuration files. It functions as a quality gate for automated workflows and a language server that provides real-time diagnostics and linting errors directly within supported text editors. The project utilizes a gRPC plugin framework that allows for the integration of custom provider-specific validation rules via independent binaries and a dedicated SDK. This architecture separates core linting logic from cloud-specific validation, supporting the au

h8mail is an open-source intelligence tool for searching leaked credentials and compromised accounts across remote APIs and local data dumps. It functions as a credential leak hunter and email reconnaissance framework designed to identify exposed passwords and sensitive information using usernames, domains, IP addresses, and email hashes. The tool distinguishes itself through a recursive target expansion system that feeds newly discovered email addresses back into the search queue to broaden the scope of investigations. It also includes a local breach data parser that employs multiprocessing

gosec is a static analysis security tool designed to scan Go source code for vulnerabilities and common coding flaws. It functions as a security analyzer that inspects the abstract syntax tree to identify insecure function calls, API usage, and potential security risks. The tool distinguishes itself by mapping detected vulnerabilities to Common Weakness Enumeration identifiers for standardized reporting and integrating with external AI models to suggest code fixes for identified issues. Its capabilities cover the detection of injection vulnerabilities, hardcoded credentials, weak cryptograph

Bundlephobia is a suite of tools for analyzing the composition and size of JavaScript dependencies from the npm registry. It functions as a bundle analyzer and size monitor that calculates the total footprint of frontend packages and stylesheets to determine their impact on page load performance. The project identifies specific components contributing to bundle size through asset composition analysis and package auditing. It also generates visual size indicators and badges that can be embedded in documentation and version control repositories to communicate package dimensions. The platform m

size-limit is a set of specialized tools for measuring JavaScript bundle sizes and enforcing performance budgets within continuous integration pipelines. It functions as a bundle size monitor and budget enforcer that can reject pull requests when JavaScript bundles exceed predefined size thresholds. The project distinguishes itself by providing a browser-based execution profiler that calculates the time required to compile and execute JavaScript on simulated low-end hardware. It also includes a tree-shaking validator that analyzes partial import bundle sizes to verify that unused code is corr

DoKit is a frontend development debugging toolset designed for web and mobile applications. It provides a suite of utilities for intercepting network traffic, mocking API responses, inspecting UI hierarchies, and monitoring mobile app performance. The project is distinguished by its focus on hybrid app inspection, allowing developers to execute scripts within web views and browse internal application sandboxes. It includes a visual UI audit tool with alignment rulers and color pickers to verify that interfaces match design specifications, as well as a diagnostic system that tracks CPU usage a

WinDirStat is a disk usage visualizer and storage analysis tool designed to scan drives and represent file and folder sizes. It functions as a system for calculating subtree sizes and identifying storage bottlenecks on a local file system. The utility distinguishes itself through a proportional treemap and an interactive directory tree, where the area of each block corresponds to the size of the file. It utilizes an extension-based color mapping system to categorize data types visually and provides a reporter that aggregates storage consumption by file type. The software covers broad storage

Laravel Mix is a frontend build tool and a configuration wrapper for Webpack that simplifies the bundling of JavaScript, TypeScript, and CSS assets. It functions as a task runner and static asset manager, providing a simplified interface to compile source files into optimized production assets. The project distinguishes itself by providing a fluent API that abstracts complex bundling configurations into human-readable method calls. It includes specialized pipelines for transforming Vue and React components into browser-compatible JavaScript and offers a system for automatic vendor prefixing a

OpenReplay is a session replay platform and frontend debugging suite designed to record and play back user browser sessions. It functions as a user behavior monitoring system that captures interaction patterns and technical metadata to identify conversion issues and revenue loss. The platform is distinguished by its self-hosted infrastructure model, allowing the recording and analytics pipeline to be deployed on private servers for full control over data residency. It also includes a browser co-browsing tool for real-time screen sharing and direct communication to provide immediate technical

tui.chart is a statistical charting engine and data visualization library designed to render interactive charts and graphs for complex numerical datasets. It functions as a responsive charting framework capable of producing various statistical representations, including line, bar, scatter, bubble, and treemap charts. The library distinguishes itself through an interactive visualization system that supports synchronized tooltips across multiple charts, range-based zooming, and data series selection. It includes a layout engine that automatically adjusts chart dimensions and animations based on

This project is a browser automation toolset and Model Context Protocol server that connects large language models to live browser sessions. It provides a web debugging interface and a quality auditor to facilitate the analysis of document object model structures and browser logs. The system implements a bridge that streams diagnostics into AI-powered editors, allowing for the automated identification of web bugs. It features a data sanitization pipeline that removes cookies and sensitive headers to prevent private information leakage during the analysis process. The toolset covers a range o

Fuse-Box is a JavaScript bundler, module loader, and development web server. It packages JavaScript source files into optimized bundles for execution in both browser and server environments. The project manages the front-end development workflow by combining asset bundling with a local server to preview application changes in real time. It includes a programmatic API for loading and executing JavaScript modules in the browser. The system handles JavaScript asset bundling and module loading through dependency-graph analysis and dynamic entry-point resolution. It employs an incremental build p

MPX is a cross-platform framework designed to build applications for multiple mini-program ecosystems and the web from a single codebase. It utilizes a static transpilation pipeline to transform source code into platform-specific bundles, employing a single-file component system that encapsulates templates, logic, and styles. The framework provides a reactive state management system that automatically synchronizes application data with the user interface through computed properties and watchers. The project distinguishes itself through a robust build-time toolchain that supports sub-package p

Microbundle is a zero-configuration JavaScript module bundler designed to package small libraries and modules into optimized distribution files. It serves as a JavaScript library packager and TypeScript compiler, converting source code into compatible module formats for both browser and server-side runtimes. The tool functions as a bundle size optimizer by mangling object properties and analyzing bundle composition to reduce final file sizes. It also acts as a CSS module processor, converting style imports into external stylesheets or scoped modules to prevent global namespace collisions. It

This package is a library for automating the compression and file size reduction of images within a web application. It functions as a utility that intercepts media assets to ensure they are optimized for web delivery before they are stored or served. The project distinguishes itself by orchestrating external command-line tools to perform heavy compression tasks outside of the main application runtime. It utilizes a strategy-based approach where individual processing algorithms are encapsulated into interchangeable classes, allowing for the development of custom optimization pipelines tailore

This project is a collection of patterns and configurations for deploying AI agents with specialized technical skills and personas. It provides a framework for agentic software engineering, defining standards for AI-driven development workflows and the management of modular technical capabilities. The system features a skill framework that activates technical guidelines based on prompt intent and a context management system that preserves project state using persistent plans and checklists across session resets. It employs a modular organization of guidelines to prevent context window overflo

Incubator-weex is a cross-platform mobile framework used to build user interfaces that run across different operating systems from a single codebase. It functions as a native UI renderer and a JavaScript native UI bridge, sending serialized UI descriptions from a JavaScript engine to native mobile components. The project includes a cross-platform UI bundler and build tool to compile source code into optimized bundles for native renderers. It also provides a UI previewer and prototyping toolset that allows for testing mobile interface pages within web browsers and on physical devices. The fra

This project is a suite of analytical tools for quantifying web performance, specifically designed for benchmarking the rendering speed and memory usage of various JavaScript frameworks. It provides a standardized set of DOM manipulation tests and a comparison tool that uses weighted geometric means to measure efficiency across different web implementations. The benchmark harness distinguishes itself by providing deep analysis of DOM reconciliation strategies, comparing the performance and correctness of keyed versus non-keyed rendering. It also includes a memory profiler for tracking allocat

Oxipng is a high-performance command-line utility written in Rust designed for lossless PNG image optimization and data minimization. It functions as a lossless compressor that reduces file sizes without altering visual quality. The tool distinguishes itself through the use of multi-threaded task parallelism to accelerate the processing of large image batches. It employs iterative recompression strategies and symmetric-pass optimization to find the smallest possible file size for each image. The software's capability surface covers the removal of non-essential metadata chunks and the normali

Connect-assets is a Node.js asset pipeline and frontend build tool designed to manage the compilation, minification, and serving of scripts and stylesheets. It functions as a static asset bundler that resolves dependency graphs to concatenate source files into optimized bundles, reducing the number of network requests required for page delivery. The tool distinguishes itself by integrating directly into the development lifecycle through middleware that intercepts HTTP requests to compile and serve assets on demand. For production environments, it provides a command-line interface to precompil